scholarly journals Structural dynamics at boreal forest edges created by a spruce budworm outbreak

Silva Fennica ◽  
2015 ◽  
Vol 49 (3) ◽  
Author(s):  
Caroline Franklin ◽  
Karen Harper ◽  
Liam Murphy
Keyword(s):  
Boreal Forest ◽  
Structural Dynamics ◽  
Spruce Budworm ◽  
Forest Edges

scholarly journals Phenological synchrony between eastern spruce budworm and its host trees increases with warmer temperatures in the boreal forest

2018 ◽  
Vol 9 (1) ◽  
pp. 576-586 ◽  
Author(s):  
Deepa S. Pureswaran ◽  
Mathieu Neau ◽  
Maryse Marchand ◽  
Louis De Grandpré ◽  
Dan Kneeshaw
Keyword(s):  
Boreal Forest ◽  
Spruce Budworm ◽  
Eastern Spruce Budworm ◽  
Host Trees ◽  
Phenological Synchrony

Lepidoptera wing scales: a new paleoecological indicator for reconstructing spruce budworm abundance

2018 ◽  
Vol 48 (3) ◽  
pp. 302-308 ◽  
Author(s):  
Lionel Navarro ◽  
Anne-Élizabeth Harvey ◽  
Hubert Morin
Keyword(s):  
Boreal Forest ◽  
Fire History ◽  
Choristoneura Fumiferana ◽  
Sediment Cores ◽  
Spruce Budworm ◽  
Natural Disturbances ◽  
Original Approach ◽  
Size Scales ◽  
Forest Landscape Dynamics ◽  
Wing Scales

Natural disturbances have a major impact on boreal forest landscape dynamics, and although fire history is well documented at the Holocene scale, spruce budworm (Choristoneura fumiferana (Clemens)) (SBW) dynamics have only been known for the last three centuries. This is likely due to the difficulty in using and interpreting existing indicators (cephalic head capsules and feces). In this methodological study, we present an original approach using lepidopteran wing scales to reconstruct insect abundance. We analyzed two sediment cores from the boreal forest in central Quebec and extracted wing scales at every stratigraphic level. The required quantity of sediment for paleoecological analysis is relatively small given the large quantity of wing scales produced by Lepidoptera and their small size. Scales are well preserved due to their chitinous structure and their great variety of shapes offer a high potential for taxonomic identification. A statistical model based on the shape of scales of the three major epidemic lepidopterans in Quebec discriminated 68% of SBW scales. This indicator allows a more efficient and more precise reconstruction of SBW history with respect to the use of cephalic head capsules or feces.

Partial windthrow as a driving process of forest dynamics in old-growth boreal forests

2014 ◽  
Vol 44 (10) ◽  
pp. 1165-1176 ◽  
Author(s):  
François Girard ◽  
Louis De Grandpré ◽  
Jean-Claude Ruel
Keyword(s):  
Boreal Forest ◽  
Forest Dynamics ◽  
Boreal Forests ◽  
Tree Mortality ◽  
Stand Structure ◽  
Temporal Dynamics ◽  
Spruce Budworm ◽  
Climatic Conditions ◽  
Balsam Fir ◽  
Vegetation Development

As climate changes, boreal forest ecosystems may become subject to disturbances that were previously uncommon in some regions. In recent decades, large tracts of northeastern boreal forest of Canada have been affected by different types of climatic events causing a lot of partial and some total stand mortality. Since these disturbances may become more important drivers of forest dynamics, there is a need to document their impact on forest structure. The objectives of this study were to describe temporal dynamics of partial windthrows and determine the effect of partial windthrow on stand composition and understory vegetation. The study was conducted in the North-Shore region of Quebec (Canada). Eighteen plots in closed forests were paired with 18 adjacent windthrow areas, in which trees experienced similar edaphic and climatic conditions. Dendroecological analyses, combined with vegetation sampling, were conducted on each site to determine stand structure and vegetation development through time. Significant increases in balsam fir and shade-tolerant species were observed in windthrow gaps. Tree mortality in windthrown stands was a slow process until the mid-1990s, a period during which spruce budworm defoliation may have played a role in weakening trees and making them more vulnerable to partial windthrow. Greater mortality observed following the mid-1990s was most certainly related to a regional storm. The initial composition of stands plays an important role in driving postwindthrow succession, as balsam fir is more susceptible to treefall. As opposed to stand-replacing windthrow and spruce budworm outbreaks that generate various postdisturbance responses, partial windthrow appears to only create opportunities for pre-established balsam fir to undergo release in gaps.

Modelling Spatial Interactions Among Fire, Spruce Budworm, and Logging in the Boreal Forest

Ecosystems ◽  
2010 ◽  
Vol 14 (1) ◽  
pp. 60-75 ◽  
Author(s):  
Patrick M. A. James ◽  
M.-J. Fortin ◽  
B. R. Sturtevant ◽  
A. Fall ◽  
D. Kneeshaw
Keyword(s):  
Boreal Forest ◽  
Spruce Budworm ◽  
Spatial Interactions

scholarly journals Stand age structural dynamics of conifer, mixedwood, and hardwood stands in the boreal forest of central Canada

2013 ◽  
Vol 03 (03) ◽  
pp. 215-223 ◽  
Author(s):  
Jennifer M. Fricker ◽  
Jian R. Wang ◽  
H. Y. H. Chen ◽  
Peter N. Duinker
Keyword(s):  
Boreal Forest ◽  
Structural Dynamics ◽  
Stand Age ◽  
Central Canada
Sign in / Sign up

Export Citation Format

Share Document